Coke-oven door.



, PATENTED AUG. 11, 1903. G. D. MAGDOUGALL.

COKE OVEN 'DOOR.

APPLICATION FILED MAR. 1a, 1903.

2 SHEETS-SHEET 1.

THL norms FLTERS no. FHOTO-LITHO WASNlNGTDN, a. c.

No; 736,281. 'PATENTBD AUG. 11.1903.

' GJD. MAGDOUGALL.

00KB OVEN DOOR.

APPLICATION FILED MAR. 18, 1903- N0 MODEL.

2 SHEETS-SHEET Z.

UNITED STATES GEORGE D. MACDOUGALL,

Patented August 11, 1903.

PATENT FFICE.

OF BUFFALO, NEW YORK.

.COKE-OVEN DOOR.

SPECIFICATION forming part of Letters Patent No. 736,281, dated August 11, 1903 Application filed March 18, 1903. Serial No. 148,398. (No model.)

T at whom it may concern.-

Be itknown that I, GEORGE D. MACDOU- GALL, a citizen of the Dominion of Canada, and a resident of-Buffalo, in the county of Erie and State of New York, have made a certain new and useful Invention in Coke-Oven Doors; and I declare the following to be a full, clear, and exact description of the same,

such as will enable others skilled in the art to whichit appertains to make and use the invention, reference being had to the accompanying drawings, and to characters of reference marked thereon, which form a part of this of the levers m.

The invention relates to ovens and furnaces, and especially to open-end coke-ovens; and

r it consists in the novel construction and combinations of parts, as hereinafter set forth.

The object of the invention is mainly to provide such ovens with self-sealing doors which may be readily operated with a minimum expenditure of time and labor.

In the accom panying drawings, illustrating theinvention in connection with a coke-oven, the letter a, designates the end of a coke-oven, to which is secured a door-casing I), usually of iron. This door-casing is provided on opposite sides or opposite edges with the hollow ventilated buckstays 0, these consisting of elongated steel bars or frames projecting or standing out from the casing and having the vertical edge flanges d, which are beveled on their under surfaces e, such surfaces being inclined from root to edge outward or away from the door-casing in such wise as to provide pressure of gradually-increasing degree toward the door-frame.

The doorfis hung in the usual manner and is designed to swing easily between the parallel buckstays to position, its inner portion entering the doorway of the door-frame and its outer wide inturned flange g impinging against the asbestos packing h, which is seated in a recess 76 of saiddoor-framer The door is provided with a series of boltholes for the reception of the pivot-boltsl of the exterior latch-levers m, which are thereby pivoted to the door-frame in series, their pivot-bolts being in line with each other. The ends of' each latch-lever are beveled or qrabbeted on their outer edges, as indicated at p, and the levers are of proper length to provide for the engagement of their ends with the beveled flanges of the buckstays to press the flange 9 against packing h. At the same time they are made of proper length for disengagement from said flanges when turned to inclined position. Usually the levers are connected bya bar or bars 3, which being'pivoted to the lovers at opposite end portions thereof, as indicated at t, serve as coupling-bars, whereby all the levers of the iseries may be operated at one time. Threaded perforations u are made through the end portions of the levers at points corresponding to .the position of the outer flange of the door and the asbestos packing, and in engagement with these perforations are provided vertical pressure-screws z, which are designed to engage the outer surface of the door at these points, so that when the latchlevers are locked in engagement with the flanges of the buckstays the screws can be turned to force the outer flange g to intimate contact with the asbestos packing, sealing the joint in a secure manner;

Access to the upper part of the oven is provided by means of the circular opening 2,

which is supplied with the annular flanged cover 3. The cover is held in place by its lugs 4 4 engaging bya half-turn the up and down extending lugs 5 5, which are connected to the door at both sides of the opening.

It will be seen that when the rotary latchlevers are turned to engagement with the sloping flanges of the buckstays their pressure upon the door becomes greater and greater as the movement of these latchF'leVers continues, and when the door is looked as firmly and securely as can be accomplished with these levers additional security is provided by turning the pressure-screws z of said levers against the marginal portion of the door, forcing its sealing-flange to close con- Ice tact with the asbestos packing in the doorframe. In this manner the tightness of the joint between the door-flange and the asbestos I packing can be adjusted to suit the necessities of the case.

The doorf is of vertically-elongated form, having the flange g, long-vertically and short at top and bottom. Thevertical series of pressure-screws 2 will thus bind the flange against the packing at intervals sufficiently close together to form a tight joint. The bandle coupling-bars s are needed at each end portion of the latch-levers on account of the frictional bind of the beveled end rabbets of the latch levers against the buckstays at each side of the door. The doorfis provided with the inwardly-projecting flame guard or fenderf'.

Having described this invention, what I claim, and desire to secure by Letters Patent,

1. In an oven, the combination of the doorcasing having the packing, the buckstays having the inclined or beveled vertical edge flanges, the door having the inturned flange engaging said packing, the exterior rotary latch-levers pivoted to the door and having the beveled end rabbets engaging the beveled flanges of said buckstays to press the doorflange against said packing, substantially as specified.

2. In an oven, the combination of the doorcasing having the packing, the buckstays having the inclined or beveled vertical edge flanges, the door having the inturned flange engaging said packing, the exterior rotary recast latch-levers pivoted to the door and having the beveled end rabbets engaging the beveled flanges of said buckstays to press the doorflange against said packing, and the twoexterior handle coupling-bars connecting said latch-levers at opposite end portions thereof, substantially as specified.

3. In an oven, the c'ombinationof the doorcasing having the packing, the buckstays having the inclined or beveled vertical edge flanges, the vertically-elongated door having the long vertical inturned flange and the short bottom and top flange engaging said packing, the series of exterior rotary latch-levers pivoted to the door and having the beveled end rabbets engaging the beveled flanges of said buckstays to press said door-flange against said packing, and the vertical series of pressure-screws in said latch-levers, substantially as specified.

4. In an oven, the doo'r-casing having the packing, the hollow forwardly-offset vertical buckstays having the inclined or beveled vertical edge flanges, the door having the inturned flange engaging said packing and the inwardly-projecting guard or fender within said flange, the exterior rotary latch-levers pivoted to the door, and having the ,beveled end rabbets engaging the beveled flanges of said buckstays, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

GEO. D. MAODOUGALL.

Witnesses:

F. O. BAKER, JAMES A. WHITE. 

